【C++】atoi函数
https://blog.csdn.net/qiangqiang103/article/details/115566620
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https://blog.csdn.net/youbang321/article/details/7888138?spm=1001.2101.3001.6650.10&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-10-7888138-blog-115566620.pc_relevant_multi_platform_whitelistv4&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-10-7888138-blog-115566620.pc_relevant_multi_platform_whitelistv4&utm_relevant_index=13
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